| Level | Description |
|---|---|
| 1 | High-quality prospective randomised clinical trial |
| 2 | Prospective comparative study |
| 3 | Retrospective case control study |
| 4 | Case Series |
| 5 | Expert Opinion |
Reviewed by Professor Phong Tran, Head of Orthopaedic Surgery, Western Health. Last updated 25 August 2026.